10 TORTOISES, TERRAPINS, AND TURTLES. 



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28. EMYS TECTUM, Bell. 

 Tab. XLV. 



Fangshtira tecta, Gray, Cat. Sh. Rept. Suppl. p. 60. 

 Hab. India. 



29. KINOSTERNON SCORPIOIDES, Gmy. 



Tab. XLVI. 



Swanka scorjpioides. Gray, Cat. Sli. Rept. Suppl. p. 67. 



Hab. Mexico and Surinam. 



This is a very variable species ; for after the study of numerous specimens, many of them in very 

 different states of preservation, I find them so variable that I believe the differences chiefly depend on the 

 kind and clearness of the water which they inhabit ; bvit I have not been able to discover any permanent 

 character to sej)arate them into species, some coming from Surinam or Guiana on the east side, and 

 others from Mexico on the west side of the American continent. 



30. CHELODINA LONGICOLLIS, Gray. 



Tab. XLVII. & XLVIII. 



Chelodina longicollis, Gray, Cat. Sh. Rept. Suppl. p. 72. 



Hab. Australia. 



The sternum of this species is peculiarly broad and oval in front, and the shields of it are surrounded 

 by a dark edge. The shields of the dorsal disk are very thin and veined. It is peculiar for the extreme 

 length of the neck, and, like all the other species of the genus, hides its head under the side of the 

 shell when oppressed, and does not withdraw it into the shell as most other Tortoises. 



31. HYDRASPIS GALEATA, Schoepff. 



Tab. XLIX. & L. 



Pelomedusa subrufa, Gray, Cat. Sh. Rept. Suppl. p. 81. 



Hab. South Africa ; Cape of Good Hope. 



The Cape Pelomedusa subrnifa is always known by the uniform colour of its shell, while the 

 JPelomediisa nigra, from Natal, is blacker and has the lower margin varied with triangular red 

 spots. 



